The Storage Cluster Continuous Copy function is an ETERNUS Disk storage system function that maintains consistency on both storage devices by copying in the Primary Storage and Secondary Storage simultaneously. In a Storage Cluster environment, if a failover occurs in the Primary Storage while executing Advanced Copy, this is a function that can continue the copy operation with the Secondary Storage by automatically taking over the Advanced Copy process. For this reason, even if the power is interrupted due to a power cut, or a box failure occurs, the Advanced Copy operation can be continued without stopping the copy session.
This section explains the operation of AdvancedCopy Manager CCM when using the Storage Cluster Continuous Copy function.
Refer to "Storage Cluster Function" in the Storage Cruiser Operation Guide for Storage Cluster function explanation.
Figure 3.26 Storage Cluster Continuous Copy Function
When using the Storage Cluster Continuous Copy function, AdvancedCopy Manager CCM creates copy pairs for the Primary Storage and Secondary Storage simultaneously when setting the environment. When operating the copy sessions, specify the copy group or one of the copy pairs for either the Primary Storage or Secondary Storage when executing commands. When executing Advanced Copy from a TFOV to a TFOV, operation of the Storage Cluster Continuous Copy function starts the copy sessions on both the Primary Storage and Secondary Storage. For this reason, Advanced Copy can be executed without considering the storage device status.
In AdvancedCopy Manager CCM, sessions on the storage device where the TFO status is "Active" are referred to as "Active-Side Continuous Copy Session" and sessions on the storage device where the TFO status is "Standby" are referred to as "Standby-Side Continuous Copy Session".
Point
Advanced Copy can be executed even if either the Primary Storage or Secondary Storage is stopped. When executing AdvancedCopy Manager CCM commands, it is possible to specify copy pairs on the storage device that is stopped. Even when copy pairs are specified on either the Primary Storage or Secondary Storage, the ETERNUS Disk storage system where the TFO status is "Active" is automatically determined, and copying is performed on that ETERNUS Disk storage system.
The Storage Cluster Continuous Copy function cannot be used in the following combinations. Use the previous Advanced Copy.
TFOV and non-TFOV
Non-TFOV and non-TFOV
Remote Advanced Copy from a TFOV to a TFOV is not supported.
In the Storage Cluster environment, Remote Advanced Copy from a TFOV to a non-TFOV is supported. Refer to "3.11 Operations of Advanced Copy Using TFOV" for details.
Advance Copy from a TFOV that belongs to a TFO group of an Active-Active configuration to a TFOV is not supported.
